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Influence of Controlled Acidity of Hole-Collecting Buffer Layers on the Performance and Lifetime of Polymer:Fullerene Solar Cells

Title
Influence of Controlled Acidity of Hole-Collecting Buffer Layers on the Performance and Lifetime of Polymer:Fullerene Solar Cells
Authors
Kim, HwajeongNam, SunghoLee, HyenaWoo, SunghoHa, Chang-SikRee, MoonhorKim, Youngkyoo
DGIST Authors
Woo, Sungho
Issue Date
2011-07-14
Citation
Journal of Physical Chemistry C, 115(27), 13502-13510
Type
Article
Article Type
Article
Keywords
Active LayerBlend FilmsBuffer LayersButyric AcidConducting PolymersDevice PerformanceFatty AcidsFullerenesLife-Time TestsMethyl EstersMolar RatioOptical WaveguidesPEDOT:PSSPoly(3-Hexylthiophene)Poly(3,4-Ethylenedioxythiophene) (PEDOT)Polymer FilmsSulfonic Acid GroupsSun Illumination
ISSN
1932-7447
Abstract
We report the influence of the controlled acidity of the holecollecting buffer layer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), on the performance and lifetime of polymer:fullerene solar cells. The acidity was controlled by adding a strong base (NaOH) to the pristine PEDOT:PSS solutions. The NaOH-modified PEDOT:PSS layers were used for fabricating polymer:fullerene solar cells with active layers made from blend films of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM). The results showed that a small addition of NaOH (0.2 molar ratio) removed 23% of the sulfonic acid groups but did not change the device performance, even though further NaOH addition degraded the device performance owing to an increased sheet resistance and lowered work function, as well as a changed surface morphology. Storage lifetime tests showed that the device with the modified PEDOT:PSS layer (0.2 molar ratio NaOH) was almost not degraded, whereas the pristine PEDOT:PSS layer might affect the deterioration at the interface with the active layer (P3HT: PCBM). Under 1 sun illumination for 10 h, the modified PEDOT:PSS layer (0.2 molar ratio NaOH) resulted in ∼25% improved lifetime, which is in excellent agreement with the extent of reduction of the sulfonic acid groups (∼23%).© 2011 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5389
DOI
10.1021/jp2028615
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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